疲れる vs 疲労する
Japanese word comparison
Listen to 疲れる
Listen to 疲労する
| 疲れる | 疲労する |
|---|---|
tsu-ka-RE-ru verb (ru-verb/intransitive) | hirou suru verb (ru-verb/intransitive) |
| to become tired; to get fatigued (physically or mentally) | to become fatigued; to suffer fatigue (formal/technical) |
How they differ
疲労する is more formal and clinical than 疲れる, emphasizing accumulated or physiological fatigue; it's common in medical, business, or written contexts and sounds unnatural in casual conversation where 疲れる is preferred.
When to use each
When to use 疲れる: Use 疲れる in everyday conversation to describe ordinary tiredness or exhaustion.
When to use 疲労する: Use 疲労する in formal writing, reports, or medical contexts, or when emphasizing accumulated/long-term fatigue.
Side-by-side examples
- 長時間の勉強で疲れた。
(I got tired from studying for a long time.) - 長時間の勉強で疲労した。
(I became fatigued from studying for a long time.)
Register & nuance: Formal/technical; 疲労する is typical in written reports, medical contexts, or formal speech.